TI DA8xx MUSB driver equipped with DeviceTree support.
Tested with AM1808 board and USB2.0 (OTG) in host mode.
Signed-off-by: Petr Kulhavy <petr@xxxxxxxxx>
---
.../devicetree/bindings/usb/da8xx-usb.txt | 63 ++++++++
drivers/usb/musb/da8xx.c | 162 +++++++++++++++++++++
include/linux/platform_data/usb-davinci.h | 3 +-
3 files changed, 227 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/usb/da8xx-usb.txt
diff --git a/Documentation/devicetree/bindings/usb/da8xx-usb.txt b/Documentation/devicetree/bindings/usb/da8xx-usb.txt
new file mode 100644
index 0000000..69c0961
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/da8xx-usb.txt
@@ -0,0 +1,63 @@
+TI DA8xx MUSB
+~~~~~~~~~~~~~
+
+Required properties:
+~~~~~~~~~~~~~~~~~~~~
+ - compatible : Should be "ti,da8xx-musb"
+
+ - reg: offset and length of the usbss register sets
+
+ - interrupts: USB interrupt number
+
+ - interrupt-names: should be set to "mc"
+
+ - dr_mode: The USB operation mode. Should be one of "host", "peripheral" or "otg".
+
+ - mentor,power : Specifies the maximum current in milli-ampers the controller can
+ supply in host mode. The maximum configurable value is 510mA.
+
+ - mentor,num-eps : Valid only in host mode. Specifies the number of target endpoints
+ supported by the controller. For DA8xx it is "5".
+
+ - mentor,multipoint : Valid only in host mode. Enables addressing of USB hubs,
+ which is normally something you want and therefore should be set to "1".
+ If set to "0" only point-to-point communication is enabled, i.e. only a single
+ device can be attached.
+
+ - mentor,ram-bits : This 2-base logarithm value defines the RAM FIFO size of the controller.
+ The FIFO size is calculated in 32-bit words. E.g. if your controller has 4kiB of RAM FIFO
+ this value should be set to "10": 2^10 = 1024 words of 32-bits, i.e. 4096 bytes.
+ For the DA8xx controller this value should be set to 10.
+
+
+Optional properties:
+
+ - ti,phy20-clkmux-cfg: Integer. Defines the USB 2.0 PHY reference clock source.
+ Supported values: "0" for external pin, "1" for internal PLL.
+
+ - ti,phy20-refclock-frequency : Integer. Defines the USB 2.0 PHY reference clock input
+ frequency in Hz in case the clock is generated by the internal PLL.
+ Supported values are 12MHz, 13MHz, 19.2MHz, 20MHz, 24MHz, 26MHz, 38.4MHz, 40MHz, 48MHz
+
+
+Example:
+
+ usb20: usb@1e00000 {
+ compatible = "ti,da8xx-musb";
+ ti,hwmods = "usb_otg_hs";
+ reg = <0x00200000 0x10000>;
+ interrupt-parent = <&intc>;
+ interrupts = <58>;
+ interrupt-names = "mc";
+
+ dr_mode = "host";
+ mentor,power = <500>;
+ mentor,multipoint = <1>;
+ mentor,num-eps = <5>;
+ mentor,ram-bits = <10>;
+
+ ti,phy20-clkmux-cfg = <1>; /* PHY clock internally generated from the PLL */
+ ti,phy20-refclock-frequency = <24000000>;
+
+ status = "okay";
+ };
diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index 4e13fe2..281d503 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -1,6 +1,9 @@
/*
* Texas Instruments DA8xx/OMAP-L1x "glue layer"
*
+ * DT support
+ * Copyright (c) 2015-2016 Petr Kulhavy, Barix AG <petr@xxxxxxxxx>
+ *
* Copyright (c) 2008-2009 MontaVista Software, Inc. <source@xxxxxxxxxx>
*
* Based on the DaVinci "glue layer" code.
@@ -36,6 +39,8 @@
#include <mach/da8xx.h>
#include <linux/platform_data/usb-davinci.h>
+#include <linux/of_platform.h>
+#include <linux/usb/of.h>
#include "musb_core.h"
@@ -134,6 +139,35 @@ static inline void phy_off(void)
__raw_writel(cfgchip2, CFGCHIP2);
}
+/* converts PHY refclk frequency in HZ into USB0REF_FREQ config value
+ * on unsupported frequency returns -1
+ */
+static inline int phy_refclk_cfg(int frequency)
+{
+ switch (frequency) {
+ case 12000000:
+ return 0x01;
+ case 13000000:
+ return 0x06;
+ case 19200000:
+ return 0x05;
+ case 20000000:
+ return 0x08;
+ case 24000000:
+ return 0x02;
+ case 26000000:
+ return 0x07;
+ case 38400000:
+ return 0x05;
+ case 40000000:
+ return 0x09;
+ case 48000000:
+ return 0x03;
+ default:
+ return -1;
+ }
+}
+
/*
* Because we don't set CTRL.UINT, it's "important" to:
* - not read/write INTRUSB/INTRUSBE (except during
@@ -527,6 +561,35 @@ static const struct platform_device_info da8xx_dev_info = {
.dma_mask = DMA_BIT_MASK(32),
};
+static int get_musb_port_mode(struct device_node *np)
+{
+ enum usb_dr_mode mode;
+
+ mode = of_usb_get_dr_mode(np);
+ switch (mode) {
+ case USB_DR_MODE_HOST:
+ return MUSB_HOST;
+
+ case USB_DR_MODE_PERIPHERAL:
+ return MUSB_PERIPHERAL;
+
+ case USB_DR_MODE_OTG:
+ return MUSB_OTG;
+
+ default:
+ return MUSB_UNDEFINED;
+ }
+}
+
+static int get_int_prop(struct device_node *dn, const char *s)
+{
+ int ret;
+ u32 val;
+
+ ret = of_property_read_u32(dn, s, &val);
+ return ret ? 0 : val;
+}
+
static int da8xx_probe(struct platform_device *pdev)
{
struct resource musb_resources[2];
@@ -535,6 +598,7 @@ static int da8xx_probe(struct platform_device *pdev)
struct da8xx_glue *glue;
struct platform_device_info pinfo;
struct clk *clk;
+ struct device_node *np = pdev->dev.of_node;
int ret = -ENOMEM;
@@ -560,6 +624,95 @@ static int da8xx_probe(struct platform_device *pdev)
glue->dev = &pdev->dev;
glue->clk = clk;
+ if (IS_ENABLED(CONFIG_OF) && np) {
+ struct musb_hdrc_config *config;
+ struct musb_hdrc_platform_data *data;
+ u32 phy20_refclock_freq, phy20_clkmux_cfg;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ ret = -ENOMEM;
+ goto err5;
+ }
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto err5;
+ }
+
+ config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL);
+ if (!config) {
+ ret = -ENOMEM;
+ goto err5;
+ }
+
+ pdata->mode = get_musb_port_mode(np);
+ config->num_eps = get_int_prop(np, "mentor,num-eps");
+ config->ram_bits = get_int_prop(np, "mentor,ram-bits");
+ /* the "mentor,power" value is in milli-amps, whereas
+ * the mentor configuration is in 2mA units
+ */
+ pdata->power = get_int_prop(np, "mentor,power") / 2;
+ config->multipoint = of_property_read_bool(np,
+ "mentor,multipoint");
+
+ pdata->board_data = data;
+ pdata->config = config;
+
+ /* optional parameter reference clock frequency */
+ if (!of_property_read_u32(np, "ti,phy20-clkmux-cfg",
+ &phy20_clkmux_cfg)) {
+ u32 cfgchip2;
+
+ /*
+ * Select internal reference clock for USB 2.0 PHY
+ * and use it as a clock source for USB 1.1 PHY
+ * (this is the default setting anyway).
+ */
+
+ cfgchip2 = __raw_readl(
+ DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+ cfgchip2 &= ~CFGCHIP2_USB2PHYCLKMUX;
+ cfgchip2 |= (phy20_clkmux_cfg & 1) <<
+ CFGCHIP2_USB2PHYCLKMUX_SHIFT;
+
+ __raw_writel(cfgchip2,
+ DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+ }
+
+ /* optional parameter reference clock frequency */
+ if (!of_property_read_u32(np, "ti,phy20-refclock-frequency",
+ &phy20_refclock_freq)) {
+ u32 cfgchip2;
+ int phy20_refclk_cfg;
+
+ phy20_refclk_cfg = phy_refclk_cfg(phy20_refclock_freq);
+ if (phy20_refclk_cfg < 0) {
+ dev_err(&pdev->dev,
+ "invalid PHY clock frequency %u Hz\n",
+ phy20_refclock_freq);
+ ret = -EINVAL;
+ goto err5;
+ }
+
+ /*
+ * Set up USB clock/mode in the CFGCHIP2 register.
+ */
+ cfgchip2 = __raw_readl(
+ DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+ /* USB2.0 PHY reference clock is 24 MHz */
+ cfgchip2 &= ~CFGCHIP2_REFFREQ;
+ cfgchip2 |= phy20_refclk_cfg;
+
+ __raw_writel(cfgchip2,
+ DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+ }
+ }
+
pdata->platform_ops = &da8xx_ops;
glue->phy = usb_phy_generic_register();
@@ -627,11 +780,20 @@ static int da8xx_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id da8xx_id_table[] = {
+ {
+ .compatible = "ti,da8xx-musb"
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, da8xx_id_table);
+
static struct platform_driver da8xx_driver = {
.probe = da8xx_probe,
.remove = da8xx_remove,
.driver = {
.name = "musb-da8xx",
+ .of_match_table = of_match_ptr(da8xx_id_table),
},
};
diff --git a/include/linux/platform_data/usb-davinci.h b/include/linux/platform_data/usb-davinci.h
index e0bc4ab..0948ce5 100644
--- a/include/linux/platform_data/usb-davinci.h
+++ b/include/linux/platform_data/usb-davinci.h
@@ -21,7 +21,8 @@
#define CFGCHIP2_FORCE_DEVICE (2 << 13)
#define CFGCHIP2_FORCE_HOST_VBUS_LOW (3 << 13)
#define CFGCHIP2_USB1PHYCLKMUX (1 << 12)
-#define CFGCHIP2_USB2PHYCLKMUX (1 << 11)
+#define CFGCHIP2_USB2PHYCLKMUX_SHIFT (11)
+#define CFGCHIP2_USB2PHYCLKMUX (1 << CFGCHIP2_USB2PHYCLKMUX_SHIFT)
#define CFGCHIP2_PHYPWRDN (1 << 10)
#define CFGCHIP2_OTGPWRDN (1 << 9)
#define CFGCHIP2_DATPOL (1 << 8)
--
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